The ridiculously huge bitrates you're seeing on some content for 1080p isn't actually for 1080p, but for 4k, somehow SF doesn't register that as 4k but, instead, thinks it's merely 1080p...
And if you select that, SF just downloads 1080p at whatever the 1080p bitrate actually is
0xFeedBeef
Damn it. So it means it's downloading the highest bitrate 1080p, which is still overkill for a lot of the brain-dead content I download from there.
For high action stuff, H265 ~4500kbps is fine and non-action stuff ~3500kbps is plenty...